1. deep, hollow sound, explosion. Find more explosion words 2. verb for the sound produced by the (male) bittern, a bird species, to attract the females and establish their territory. each male has a unique voice. the boom of the male bittern is the lowest-pitched and the most far-carrying song produced by any European bird. it is written as "oonk-a-lunk" or "punk-er-lunk" and can be heard up to 5 km away in the right weather conditions. about this bird

1. long low inarticulate murmur, 2. (less common) word describing the sound of doves (as in "The moan of doves in immemorial elms" in the poem "Come Down, O Maid" by Alfred Lord Tennyson), 3. (less common) the sound of wind (in the poem "the night wind", by Eugene Field: "... For the wind will moan in its ruefullest tone: